Using free office softwares online

You don't have to install anything on your pc. All are being run on service's server. All your documents are safely stored on server. You can download to your pc anywhere, anytime. They can be considered as "other Microsoft Office". And the best, they are FREE.
1. Zoho: This is one of the best free Office Apps that PC World choice.
+ Zoho Writer: word processor
+ Zoho Sheet: spreadsheet application
+ Zoho Show: presentation tool
+ Zoho Projects: project management
+ Zoho CRM: CRM Solution
+ Zoho Creator: online database applications
+ Zoho Planner: organizer to maintain your todo’s, reminders, notes, attachments etc.
+ And more... (Resource http://www.zoho.com )
2. Google Docs and Spreadsheets: Free web-based word processor and spreadsheet, which allow you share and collaborate online. It 's google's product so you can trust it's quality. (http://www.docs.google.com)